Malicious PDF — malware analysis report

Static analysis result for SHA-256 8caafdc96da5ed96…

MALICIOUS

PDF

103.7 KB Created: 2020-12-17 13:11:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 41ffc441161c7ff01477c7bb241f995e SHA-1: b0aba8e43bdb119c11285017ef05de6a483974fe SHA-256: 8caafdc96da5ed96219b018292bbd547d076d566f916ca3a883d2e4fc1fcab68
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded links, many pointing to redirector infrastructure like 'ggtraff.ru'. Heuristics indicate a link farm designed to distribute content, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. While no scripts were directly extracted, the nature of the links suggests an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/strik?utm_term=linear+algebra+economics In PDF document text
    • https://static.s123-cdn-static.com/uploads/4372985/normal_5fc8def96ff1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476767/normal_5fae6283d32e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5fd6630524dee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374954/normal_5fc7f66966b54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426543/normal_5fab39623b72e.pdfIn PDF document text
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/vijumodefixazepewuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471512/normal_5fb40d2ae32e2.pdfIn PDF document text
    • https://lebotuzipum.weebly.com/uploads/1/3/4/5/134519329/8318235.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nawuvud/womud.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/defose.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/pikeville_high_school_ky_football.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc290a36609fd0ee79c0a56/t/5fcb9f21190ee82df8e05a11/1607180068027/boxing_star_mod_apk_obb_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/aristteles_tica_a_eudemo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc78a4e02915d4a16f90a6f/t/5fcd72f10ab5d62feb07960a/1607299826036/77368848022.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54724403f5353fdb27af8/t/5fd706ac491a58544a282022/1607927472425/cd_cardstock_sleeve_template.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12291 3036 bytes
SHA-256: 601b0be00a9c1f7800289ce7ba2d1cb787c798dedb0eab2be83fc2bff319e9d1
font_01_sfnt_off00012d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5A 4908 bytes
SHA-256: a49df298c141116cf96f44f7586b43a1b87f91084db3332a79b19d3a65c03eae
font_02_sfnt_off00013dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD3 12220 bytes
SHA-256: 2a5673ceed1aa503842a3e52a5130d85d0d7760ca804ffa0e70d3360d712ed58
font_03_sfnt_off000167b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167B4 17844 bytes
SHA-256: 6f427e0976f04f53b90ca5819d0af75b389298a7ba739c4a3ad61b9da6e5282a
font_04_sfnt_off000182eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182EB 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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